Overview
EN ISO 16610-28:2016 - "Geometrical product specifications (GPS) - Filtration - Part 28: Profile filters: End effects" is a CEN-endorsed ISO standard that defines methods for treating end effects when applying linear profile filters to finite measured profiles. It is part of the ISO 16610 series on filtration and sits within the GPS framework for surface and profile metrology. The standard explains how to detect, correct and document unintentional changes in the filtration response that occur near the profile ends.
Key Topics
- Scope and purpose: Methods for treating end effect regions of linear profile filters where the filter weighting function extends beyond the measured profile.
- Definitions: Key terms such as end effect, end effect region, moment, and moment criterion are specified in accordance with GPS terminology.
- Correction methods: Practical approaches described include:
- Zero padding (profile extension with zeros)
- Linear extrapolation (least‑squares line fitted to end regions)
- Symmetric extension
- Moment retainment criterion (ensuring filter weighting function moments vanish up to nth order)
- Automatic correction: Notes that certain filters (e.g. linear spline filters and Gaussian regression filters per ISO 16610-22 / ISO 16610-31 / ISO/TS 16610-32) have automatic end-effect correction; Annex A gives weighting functions for these cases.
- Recommendations and designations: Guidance on default end correction and how to designate applied end-correction methods in measurement reports.
- Normative references: Links the standard to ISO 16610-1, -20, -21, -22, -31, ISO/TS 16610-32 and ISO/IEC Guide 99 (VIM).
Applications
EN ISO 16610-28:2016 is used wherever profile filtration is applied to finite-length surface measurements:
- Surface metrology labs performing roughness and profile analysis
- Quality and manufacturing engineers specifying or verifying surface texture requirements
- Measurement software and instrument developers implementing linear profile filters (Gaussian, spline, regression) and end-effect handling
- Metrology consultants and standards writers who must ensure compliance with GPS rules when specifying filtration in technical drawings, inspection plans, and reports
Practical benefits include improved repeatability and traceability of filtered profile results, correct interpretation of parameters near profile ends, and standardized reporting of end correction methods.
Related standards
Using EN ISO 16610-28:2016 helps ensure consistent, documented handling of end effects in profile filtration-critical for accurate surface characterization and conformity assessment.